Answer:
The answer is: 26mi shorter
Step-by-step explanation:
The distance from Ferris to Butte, going through Dunlap is simply found by:
39 mi + 52 mi = 91 mi
Then to calculate the direct route we will use the Pythagorean theorem:
being c the direct route and a & b the distances from Ferris to Dunlap & Dunlap to Butte (in no particular order)
By clearing c in the equation we obtain:

Finally replacing a and b with values:




This represents the distance of the direct route, which subtracted to the first distance we calculated, results in:
